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Calling a REST service is done by URL. This means that all the information that the server needs, to process your request, is part of the URL (this is not entirely true due to HTTP headers, but close enough). Here is an example of a REST web service that allows you to receive live information on American airports:

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• The first part is the location of the webservice (https://soa.smext.faa.gov)
• The next part is a fragment (/asws/api/airport/status/IAD). Fragments are used to supply information to the web service. This particular fragment indicates that you want to retrieve the airport status from the airport with code IAD. You can request information on a different airport by changing the URL, for example: https://soa.smext.faa.gov/asws/api/airport/status/JFK?format=xml.
• Everything after the '?' are arguments. They essentially are also just information for your request. In this example the argument determines the answer format. It was set to XML in the example above.

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